Reddit, Inc. Tech Stack

Social platform with 100,000+ communities; building AI-native ads and graph ML for monetization

Social Networking Platforms San Francisco, California 1,001–5,000 employees Founded 2005 Public Company

Reddit operates a massive community platform (100,000+ subreddits) with a stack built for scale: Kafka, Spark, BigQuery, Kubernetes, and Redis handling content flow and real-time ranking. Active hiring in engineering (86 roles) paired with sales (73) and product (15) reflects a monetization pivot—the project list is dominated by native ads, AI-driven ad formats, and campaign optimization, while pain points cluster around advertiser onboarding, targeting accuracy, and ROI. Graph ML and TensorFlow adoption signal investment in ranking and recommendation systems to improve both user engagement and advertiser performance.

Tech Stack 99 technologies

Core StackTensorFlow PyTorch Apache Spark Kubeflow Apache Airflow BigQuery Python Go Scala Kafka PostgreSQL Redis Kubernetes Docker Swift JavaScript React Next.js Solr Dataflow SQL R Android Thrift Druid Argo CD iOS UIKit Swift Concurrency Apollo GraphQL+69 more

What Reddit, Inc. Is Building

◆Challenges

Optimizing campaign performance
Support rapidly expanding advertiser base
Automated abuse
Scaling revenue
Improving targeting accuracy
Improving advertiser roi
Onboarding new advertisers
Data loss
Improving platform performance for advertisers
Improving developer efficiency

▲Active Projects

New product launches
Native ads product roadmap
Ad format that uses ai to incorporate user-generated content
Test & learn roadmap
Permissions systems
Graph ml codebase
Grow torso tail accounts
Portfolio strategy development for hybrid work models
Fully customizable interactive ad format
Campaign optimization

Hiring Activity

Steady240 roles · 85 in 30d

Department

Engineering

Sales

Product

Data

Marketing

Finance

Design

Communications

Seniority

Senior

122

Staff

Mid

Manager

Director

Intern

Principal

Lead

Notable leadership hires: SMB Sales Director, Chief of Staff, Channel Partnerships Director, Measurement Lead, Director of Design

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About Reddit, Inc.

Reddit is a social platform where millions of users gather across 100,000+ community-driven forums to discuss, share, and vote on content spanning news, gaming, hobbies, and niche interests. The company monetizes through native advertising and advertiser tools, with active work on AI-powered ad formats that incorporate user-generated content and fully customizable interactive ad units. Engineering is scaling the platform across 10+ countries while addressing challenges in advertiser support, campaign performance optimization, and platform reliability. The public company operates from San Francisco with 1,001–5,000 employees.

HeadquartersSan Francisco, California

Company Size1,001–5,000 employees

Founded2005

Hiring MarketsUnited States, Germany, Philippines, India, Netherlands, Canada, United Kingdom, Australia

Frequently Asked Questions

What is Reddit's tech stack?

Reddit uses Kafka, Apache Spark, BigQuery, PostgreSQL, Redis, Kubernetes, TensorFlow, PyTorch, and Druid. Frontend relies on React, Next.js, and Apollo GraphQL; mobile uses Swift (iOS) and Kotlin (Android). The stack emphasizes real-time data processing and machine learning.

What is Reddit working on?

Active projects include native ads, AI-driven ad formats using user-generated content, fully customizable interactive ad units, campaign optimization, graph ML models, and permissions systems. The roadmap emphasizes monetization and advertiser tools.